(function ($) {

  "use strict";

  $("img.lazy").lazyload({ 
    placeholder: "images/loading.gif",
    effect: "fadeIn" ,
    threshold: 200,
  });

  // PRE loader
  $(window).load(function () {
    $('.preloader').fadeOut(100); // set duration in brackets    
  });


  //Navigation Section
  $('.navbar-collapse a').on('click', function () {
    $(".navbar-collapse").collapse('hide');
  });

  $(window).scroll(function () {
    $(".navbar-collapse.in").removeClass('in');
    if ($(".navbar").offset().top >10) {
      $(".navbar-fixed-top").addClass("top-nav-collapse");
    } else {
      $(".navbar-fixed-top").removeClass("top-nav-collapse");
    }
    if ($(".navbar").offset().top > $(window).height()*2){
      $(".contact").show();
    }else{
      $(".contact").hide();
    }
  });


  // Smoothscroll js
  $(function () {
    $('.custom-navbar a').bind('click', function (event) {
      var $anchor = $(this);
      $('html, body').stop().animate({
        scrollTop: $($anchor.attr('href')).offset().top - 49
      }, 1000);
      event.preventDefault();
    });
  });


  // WOW Animation js
  new WOW({ mobile: false }).init();

  //定义画布宽高和生成点的个数
  var WIDTH = window.outerWidth, HEIGHT = window.outerHeight, POINT
  POINT = window.outerWidth > 768?35:10
  var canvas = document.getElementById('Mycanvas');
  canvas.width = WIDTH,
    canvas.height = HEIGHT;
  var context = canvas.getContext('2d');
  context.strokeStyle = 'rgba(0,0,0,0.2)',
    context.strokeWidth = 1,
    context.fillStyle = 'rgba(0,0,0,0.1)';
  var circleArr = [];

  //线条：开始xy坐标，结束xy坐标，线条透明度
  function Line(x, y, _x, _y, o) {
    this.beginX = x,
      this.beginY = y,
      this.closeX = _x,
      this.closeY = _y,
      this.o = o;
  }
  //点：圆心xy坐标，半径，每帧移动xy的距离
  function Circle(x, y, r, moveX, moveY) {
    this.x = x,
      this.y = y,
      this.r = r,
      this.moveX = moveX,
      this.moveY = moveY;
  }
  //生成max和min之间的随机数
  function num(max, _min) {
    var min = arguments[1] || 0;
    return Math.floor(Math.random() * (max - min + 1) + min);
  }
  // 绘制原点
  function drawCricle(cxt, x, y, r, moveX, moveY) {
    var circle = new Circle(x, y, r, moveX, moveY)
    cxt.beginPath()
    cxt.arc(circle.x, circle.y, circle.r, 0, 2 * Math.PI)
    cxt.closePath()
    cxt.fill();
    return circle;
  }
  //绘制线条
  function drawLine(cxt, x, y, _x, _y, o) {
    var line = new Line(x, y, _x, _y, o)
    cxt.beginPath()
    cxt.strokeStyle = 'rgba(0,0,0,' + o + ')'
    cxt.moveTo(line.beginX, line.beginY)
    cxt.lineTo(line.closeX, line.closeY)
    cxt.closePath()
    cxt.stroke();

  }
  //初始化生成原点
  function init() {
    circleArr = [];
    for (var i = 0; i < POINT; i++) {
      circleArr.push(drawCricle(context, num(WIDTH), num(HEIGHT), num(15, 2), num(10, -10) / 40, num(10, -10) / 40));
    }
    draw();
  }

  //每帧绘制
  function draw() {
    context.clearRect(0, 0, canvas.width, canvas.height);
    for (var i = 0; i < POINT; i++) {
      drawCricle(context, circleArr[i].x, circleArr[i].y, circleArr[i].r);
    }
    for (var i = 0; i < POINT; i++) {
      for (var j = 0; j < POINT; j++) {
        if (i + j < POINT) {
          var A = Math.abs(circleArr[i + j].x - circleArr[i].x),
            B = Math.abs(circleArr[i + j].y - circleArr[i].y);
          var lineLength = Math.sqrt(A * A + B * B);
          var C = 1 / lineLength * 7 - 0.009;
          var lineOpacity = C > 0.03 ? 0.03 : C;
          if (lineOpacity > 0) {
            drawLine(context, circleArr[i].x, circleArr[i].y, circleArr[i + j].x, circleArr[i + j].y, lineOpacity);
          }
        }
      }
    }
  }
  //调用执行
  window.onload = function () {
    init();
    setInterval(function () {
      for (var i = 0; i < POINT; i++) {
        var cir = circleArr[i];
        cir.x += cir.moveX;
        cir.y += cir.moveY;
        if (cir.x > WIDTH) cir.x = 0;
        else if (cir.x < 0) cir.x = WIDTH;
        if (cir.y > HEIGHT) cir.y = 0;
        else if (cir.y < 0) cir.y = HEIGHT;
      }
      draw();
    }, 15);
  }


})(jQuery);
